SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '085ec49b3686699cb75baf6eb5a02d3ca34207d4e37957d94366ec8348801059' 
  AND token = 'p1Ast1FvAlBjBlyEpFphJzYM4/YOSum/ZzqZBWwHk8M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}